Reenforcing bar chair



Oct. 8,1935. H. L. RICHARDS REENFORCING BAR CHAIR Original Filed Oct..31, 1932 1 are 4 IN VEN TOR.

ffim/wa/y L. R/c ARDS BY 6 ATTORNEY Patented Oct. 8, 1935 UNITED STATESPATENT OFFICE Application October 31, 1932, Serial No. 640,402

Renewed December 14, 1934 4 Claims.

The invention relates to a means commonly known as a chair, forsupporting metal reenforcing in a mold for plastic material during thecasting operation.

An object of the invention is to provide a chair of the characterdescribed which will serve to hold reenforcing bars or the like lockedand rigidly fixed in desired position While cement or other plasticcomposition is being poured into the mold.

Another object of the invention is to. provide a chair of the characterdescribed in which the means for supporting and securing the chair bodyin proper position in the mold, functions to lock the bars to the body.

A further object of the invention is to provide a supporting means, withthe above mentioned features, which does not require any more parts thandevices of this kind heretofore in use, nor does it require thedeforming or other mutilation of the parts.

A still further object is to provide a device of the character describedin which the means for obtaining the proper spacing of the chair in themold is formed separate of the chair body but is arranged to beassociated therewith by the means for securing the body to the mold.

The invention possesses other objects and features of advantage, some ofwhich, with the foregoing, will be set forth in the followingdescription of the preferred form of the invention which is illustratedin the drawing accompanying and forming part of the specification. It isto be understood, however, that variations in the showing made by thesaid drawing and description may be adopted within the scope of theinvention as set forth in the claims.

Referring to said drawing:

Figure 1 is a perspective view of the complete device with reenforcingbars held therein.

Figure 2 is a vertical sectional view of the device as operativelypositioned in a. mold.

Figure 3 is a cross-sectional view taken on the line 33 of Figure 2.

Figure 4 is a perspective View of a series of concrete slabs formed toprovide a highway surface and showing the arrangement of the. chairstherein.

In the present embodiment, the device of my invention is adapted for usein supporting metal reenforcement in a mold during the formation of aconcrete slab for a highway surface. The slabs thus used are usuallyconstructed directly on the roadbed, and the mold therefor is ordinarilyprovided by the use of wooden or metal longitudinal strips at the sides,cross strips of expansible material at the ends, and the utilization ofthe upper surface of the road-bed as the bottom of the mold.

As illustrated in the drawing, the device comprises a body 5 arrangedfor upright positioning in the mold and formed of angularly related por-5 tions 6 and 1 integrally associated along one edge 8. Transverseextensions 9 project outwardly from the lower end of the portions 6 and1 and serve as a resting or base plate for the body.

Formed in the body'and extending transversely from the edge 8 are one ormore slots l2 and I3 which define seats or recesses in each body portionfor the reception of the reen'forcement for the road slab. Thereenforcement as here shown is in the form of metal bars I4 ofrectangular cross section, and the slots are of such size and form thatthe bars'may fit in the recess with the top, bottom and one sideof eachbar simultaneously engaging the top, bottom, and closed end'of therecess. The recesses may be spaced vertically, as 20 the conditionsrequire, and with the bars thus disposed in the recesses they will besupported in proper spaced relation.

Means are provided for positively locking the bars in position in thebody, and in such manner 25 that no relative transverse movement of thebar in the body will be permitted in any direction. In the presentembodiment said means is in the form of a pin I6 which serves the doublepurpose of locking the bars as aforesaid, and for securing 30 the bodyin desired position in the mold. As shown in Figure 1, the pin I6 is ofconsiderably greater length than the body and is arranged to extendcompletely through the body between the bars and the edge 8 so as'toproject considerably 35 into the roadbed material as well as to lock thebars in place. The recesses are of such depth with relation to thethickness of the bars and the pin that the pin will fit snugly in placein the body and thereby hold the bars firmly against the inner 49 end ofthe recess. In this manner, the bars will be engaged and locked in placeon all four sides thereof and. frictionally held against any movement inthe body.

The pin 16 is also used in connection with a 5 spacer clip IT forholding the body in desired spaced relation to the side walls l8 of themold. The clip [1, as will be clear from Figures 1 and 2, is provided atone end with an angular extension I9 which is perforated for thereception of a 0 nail to secure the clip to the wall, while the otherend is formed with an opening 2| for engagement with the pin. As will beclear from Figure 2 the pin is arranged to be driven in position withthe head of the pin thrust against 55 the clip and securely holding thelatter in place, and ordinarily the pin will be driven home withsufficient force to cause the longitudinally spaced portions along theedge 8 to be bent together and thereby cause each of the rods to beclamped as well as locked in position.

In applying the device in the mold, the body is first set in itsapproximately desired position on the road bed with the base portions 9resting on the surface thereof. The reenforcing bars are then insertedinto the recesses and set sufiiciently inward therein to leave a spacefor the insertion of the holding pin between the bars and edge 8. Thepin is then inserted through the spacer clip and through the body asaforesaid, the clip being then, or previously if desired, nailed orotherwise secured to the wall. With the parts thus set the pin is drivenhome thereby securely holding and locking all the parts together and tothe mold whereby pouring oi the concrete or other material'in the moldwill not dislodge the bars or displace the body relative to the mold.

I claim:

1. In a device of the character described, a body arranged to be held ina perpendicular position and comprising angularly related portionsunited along an upright edge and having a set of transversely alignedrecesses extending inwardly from said edge and arranged to receive areenforcing bar and carry the same in a substantially horizontalposition, transversely extending base portions at the lower end of thebody, a holding pin insertable irom the upper end of the body betweenthe inner side of said body and a side of said bar and arranged toretain said bar against the closed end of the recess-es and to protrudefrom the base, and a head on said pin engageable with the upper end orthe body.

2. In a reenforcing bar chair, a body having longitudinally spacedpockets opening at a side edge of the body and arranged for thereception of the bars, a base at one end of said body,

a pin arranged to be driven through the body for securing same inposition and holding the bars in the pockets, and means including a headon said pin positioned when the pin is driven 10 home to engage theother end of the body spaced from said pockets whereby the support ofsaid bars longitudinally of said body will be carried substantiallyentirely by said pockets and independent of the positioning of the bodyby means of said pin.

3. In a chair for positioning a reenforcing bar in a mold, a body havingbar supporting portions, a spacer arranged for connection with a side ofthe mold for holding the body in position, and a pin arranged to bedriven through the body and spacer for securing the bars and spacer tothe body and for anchoring the body in place.

4. In a reenforcing bar chair, a body having 5 longitudinally spacedpockets opening at a side edge of the body and arranged for thereception of the bars, a pin arranged to be extended through the bodyfor securing same in position and holding the bars in the pockets, andmeans on the pin positioned when the pin is set in final operativeposition to engage a portion of the body longitudinally aligned with thepockets but spaced therefrom whereby the support of said barslongitudinally of the body will be afforded substantially entirely bysaid pockets.

HARMON L. RICHARDS.

